WO2024092430A1

WO2024092430A1 - Display apparatus and display driving method

Info

Publication number: WO2024092430A1
Application number: PCT/CN2022/128703
Authority: WO
Inventors: 付常佳; 李丹; 石海军; 王伯长; 钟维; 屈庆山; 冯鸿博
Original assignee: 京东方科技集团股份有限公司; 北京京东方显示技术有限公司
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2024-05-10

Abstract

A display apparatus and a display driving method. Sub-pixels of the same color in adjacent rows in a display module are arranged in a staggered manner. The display driving method comprises: (S01) pre-storing the correspondence between the location of a sub-pixel in a bright-dark boundary region and a corresponding target grayscale value, wherein the bright-dark boundary region is a region of which the distance to a boundary line between bright and dark pixels is within a preset threshold value, the bright and dark pixels are adjacent sub-pixels, between which an initial grayscale difference value is greater than a first predetermined grayscale difference value, and the correspondence is the closer the location of the sub-pixel to the boundary line, which is between the bright and dark pixels, the lower the target grayscale value; and (S02) determining the current grayscale value of the sub-pixel, which is in the bright-dark boundary region, according to the pre-stored correspondence. By means of the display apparatus and the display driving method, pixels are arranged in a staggered manner, and the closer the location of a sub-pixel in a bright-dark boundary region to a boundary line between bright and dark pixels, the lower a target grayscale value, such that the brightness of pixels at a bright-dark boundary location gradually changes, the effect of a gradual transition of the brightness of a picture at the bright-dark boundary location is formed, and the problem of picture aliasing is solved.

Description

A display device and a display driving method

Technical Field

The present disclosure relates to the field of display technology, and in particular to a display device and a display driving method.

Background technique

The display area boundary of the display module has jagged images, which affects the user experience. With the development of display technology, narrow-frame and ultra-narrow-frame display modules are more and more widely used. In related technologies, shielding members such as frames or black matrices are used to shield the display area boundary pixels to improve the display effect, but this is not conducive to narrow-frame or ultra-narrow-frame design.

Summary of the invention

The embodiments of the present disclosure provide a display device and a display driving method, which can improve the jagged edge phenomenon of the display screen and are conducive to realizing a narrow frame design.

The technical solutions provided by the embodiments of the present disclosure are as follows:

In a first aspect, the present disclosure provides a display driving method for driving a display module to display; the display module has a pixel array, each pixel unit in the pixel array includes at least two sub-pixels of different colors, and sub-pixels of the same color in adjacent rows are staggered; the method comprises:

Pre-storing a correspondence between the position of a sub-pixel in a light-dark boundary area and a corresponding target grayscale value, wherein the light-dark boundary area is configured as an area within a predetermined threshold distance from a light-dark pixel boundary line, the light-dark pixels are adjacent sub-pixels whose initial grayscale difference is greater than a first predetermined grayscale difference △L1, and the correspondence is configured along a direction from the light-dark pixel boundary line to a sub-pixel with a larger initial grayscale value among the two adjacent sub-pixels, and the closer the position of the sub-pixel is to the light-dark pixel boundary line, the lower the target grayscale value;

According to the pre-stored corresponding relationship, the current grayscale value of the sub-pixel in the light-dark boundary area is determined and converted into a corresponding display signal to drive the display module to display the corresponding picture.

Exemplarily, the corresponding relationship is specifically configured as follows:

Along the direction from the boundary line between the light and dark pixels to the sub-pixel with the larger initial grayscale value among the two adjacent sub-pixels, the sub-pixels in the light and dark boundary area are divided into N groups at a predetermined interval, N is an integer greater than 1, and the predetermined interval is an integer multiple of the length of a sub-pixel along the row direction or an integer multiple of the width of a sub-pixel along the row direction; along the direction from the boundary line between the light and dark pixels to the sub-pixel with the larger initial grayscale value among the two adjacent sub-pixels, the target grayscale values of the N groups of sub-pixels gradually change from the lowest target grayscale value L0 to the highest target grayscale value Lh with a second predetermined grayscale difference △L2, and the second predetermined grayscale difference △L2 is (Lh-L0)/N.

Exemplarily, the at least two sub-pixels of different colors include a red sub-pixel, a green sub-pixel, and a blue sub-pixel;

Determining the current grayscale value of the sub-pixel in the light-dark boundary area according to the pre-stored corresponding relationship specifically includes:

Determine the current grayscale values of all color sub-pixels in the light-dark boundary area according to the pre-stored corresponding relationship; or

According to the pre-stored corresponding relationship, the current grayscale value of the green sub-pixel in the light-dark boundary area is determined, and the target grayscale values of the red sub-pixel and the blue sub-pixel in the light-dark boundary area are the initial grayscale values of the red sub-pixel and the blue sub-pixel in the light-dark boundary area.

Exemplarily, before pre-storing the correspondence between the position of the sub-pixel in the light-dark boundary area and the corresponding target grayscale value, the method further includes:

Identify the initial grayscale value of the sub-pixel in the current picture;

Identify two adjacent sub-pixels whose initial grayscale values are greater than a preset difference value according to the initial grayscale value, so as to determine the boundary line between the light and dark pixels;

The light-dark boundary area is determined according to the preset threshold.

The present disclosure also provides a display device, the display device comprising:

A display module, used for displaying a corresponding picture according to a display signal, wherein the display module has a pixel array, each pixel unit in the pixel array includes at least two sub-pixels of different colors, and sub-pixels of the same color in adjacent rows are staggered; and

A processor, the processor comprising:

A storage module pre-stores a correspondence between the position of a sub-pixel in a light-dark boundary area and a corresponding target grayscale value, wherein the light-dark boundary area is configured as an area within a predetermined threshold distance from a light-dark pixel boundary line, the light-dark pixels are adjacent sub-pixels whose initial grayscale difference is greater than a first predetermined grayscale difference △L1, and the correspondence is configured to be along a direction from the light-dark pixel boundary line to a sub-pixel with a larger initial grayscale value among the two adjacent sub-pixels, and the closer the position of the sub-pixel is to the light-dark pixel boundary line, the lower the target grayscale value; and

The control module determines the current grayscale value of the sub-pixel in the light-dark boundary area according to the pre-stored corresponding relationship, and converts it into a corresponding display signal to drive the display module to display the corresponding picture.

Exemplarily, the corresponding relationship stored in the storage module is specifically configured as follows:

Along the direction pointing from the edge of the display module to the middle area of the display module, the sub-pixels in the light-dark boundary area are divided into N groups at a predetermined interval, N is an integer greater than 1, and the predetermined interval is an integer multiple of the length of a sub-pixel along the row direction or an integer multiple of the width of a sub-pixel along the row direction; along the direction pointing from the edge of the display module to the middle area of the display module, the target grayscale values of the N groups of sub-pixels gradually change from the lowest target grayscale value L0 to the highest target grayscale value Lh with a second predetermined grayscale difference △L2, and the second predetermined grayscale difference △L2 is (Lh-L0)/N.

Exemplarily, the control module is specifically used for:

Exemplarily, the processor further includes:

An identification module, used to identify the initial grayscale value of the sub-pixel in the current picture;

A first determination module is used to identify two adjacent sub-pixels whose initial grayscale values are greater than a preset difference value according to the initial grayscale value, so as to determine the boundary line between the light and dark pixels;

The second determination module is used to determine the light-dark boundary area according to the preset threshold.

Exemplarily, the display device further includes:

The polarizer is attached to the display side and/or the non-display side of the display module, and the distance between the polarizer and the edge of the display module is less than or equal to 0.2 mm.

Exemplarily, the display device also includes a backlight source arranged on the non-display side of the display module, and the backlight source includes a frame arranged on the outside of the display module, wherein on the side facing the light output side of the display device, a light-shielding colloid is coated in the space between the frame and the edge of the display module, and the light-shielding colloid overlaps the edge of the polarizer on the display side of the display module.

Exemplarily, on a side facing the light emitting side of the display device, an edge of the frame is higher than a surface of a side of the polarizer located on the display side of the display module that is away from the display module.

Exemplarily, a light-shielding tape is attached to the outer side of the frame, and the light-shielding tape is flush with the edge of the frame on the side facing the light-emitting side of the display device.

Exemplarily, the backlight source further includes:

An optical film material is arranged on the non-display side of the display module;

A middle frame is arranged on a side of the optical film material away from the display module and supported on the edge of the display module, and the middle frame is located on the inner peripheral side of the frame; wherein

The middle frame includes a supporting surface for supporting the display module, and a width of the supporting surface in a direction from an edge of the display module to a display area of the display module is less than or equal to 0.8 mm.

Exemplarily, the number of the display modules in the display device is at least two, at least two of the display modules are spliced, and a splicing seam is formed between two adjacent display modules;

The display device further comprises a transparent cover plate, the transparent cover plate is arranged on the display side of the display module, and a surface of the transparent cover plate on a side away from the display module is a curved surface in an edge area close to the joint; or

The display device further comprises an optical lens, wherein the optical lens has a sawtooth prism structure at least in an edge region close to the joint on a surface of a side away from the display module.

The beneficial effects brought by the embodiments of the present disclosure are as follows:

The display device and display driving method provided by the embodiments of the present disclosure have a pixel arrangement structure in the display device that is arranged in a staggered order, and sub-pixels of the same color in adjacent rows are arranged in a staggered arrangement, which can improve the rainbow pattern phenomenon caused by the conventional pixel arrangement at the edge of the display module due to the local pixels at the edge of the display screen being blocked by the backlight source; at the same time, the display driving method is improved, and the sub-pixels in the light-dark boundary area are directed from the light-dark pixel boundary line to the sub-pixel with the larger initial grayscale value among the two adjacent sub-pixels. The closer the position of the sub-pixel is to the light-dark pixel boundary line, the lower the target grayscale value. In this way, the brightness of the pixel at the light-dark boundary position gradually changes, forming an effect of gradual transition of the brightness of the picture at the light-dark boundary position, thereby solving the picture jagged problem caused by the staggered pixel arrangement.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram showing a pixel arrangement structure in the related art;

FIG2 is a schematic diagram showing the principle of generating rainbow patterns when the edge of a picture is blocked in the related art;

FIG3 is a schematic diagram showing a pixel arrangement structure in some embodiments of the present disclosure;

FIG4 is a schematic diagram showing the principle of avoiding rainbow patterns when the edge of a picture is blocked in an embodiment of the present disclosure;

FIG5 is a schematic diagram showing a pixel arrangement structure in some other embodiments of the present disclosure;

FIG6 is a schematic diagram showing a pixel arrangement structure in some other embodiments of the present disclosure;

FIG7 shows a schematic diagram of the principle of mixing three primary colors;

FIG8 is a schematic diagram showing the principle of jagged edges caused by pixel misalignment when viewed from a close distance;

FIG9 shows a table of RGB brightness values measured by a display device in one embodiment;

FIG10 is a schematic diagram showing the principle of jagged edges caused by pixel misalignment when viewed from a short distance;

FIG11 is a schematic diagram showing the display effect of improving the jagged edge at the junction of light and dark by the display driving method provided by an embodiment of the present disclosure;

FIG12 is a schematic diagram showing the principle of the minimum resolution angle of the human eye;

FIG13 shows a pixel resolution distance calculation model for a display device provided by an embodiment of the present disclosure;

FIG14 is a flow chart of a display driving method according to an embodiment of the present disclosure;

FIG15 is a second flow chart of a display driving method provided by an embodiment of the present disclosure;

FIG16 is a logic diagram of a display driving method provided by an embodiment of the present disclosure;

FIG17 is a logic diagram of a display driving method provided by another embodiment of the present disclosure;

FIG18 is a schematic diagram of a Gamma curve in a display driving method provided by another embodiment of the present disclosure;

FIG19 is a schematic diagram showing the effect of improving the jagged edge at the boundary between light and dark in a black-and-white checkered picture by a display driving method provided by another embodiment of the present disclosure, wherein FIG19 (a) shows a schematic diagram showing a black-and-white checkered picture with jagged edges at the boundary between light and dark in the related art, and FIG19 (b) shows a schematic diagram showing a black-and-white checkered picture with improved jagged edges at the boundary between light and dark in the display driving method provided by an embodiment of the present disclosure;

FIG20 is a schematic structural diagram of a display module provided by another embodiment of the present disclosure;

FIG21 is a structural block diagram of a display device provided by another embodiment of the present disclosure;

FIG22 is a structural block diagram of a processor in a display device provided by another embodiment of the present disclosure;

FIG23 is a schematic structural diagram of a display device provided by another embodiment of the present disclosure;

FIG24 is a schematic diagram showing a binding side structure of a display device provided by another embodiment of the present disclosure;

FIG25 is a schematic structural diagram of a display device provided by another embodiment of the present disclosure;

FIG26 is a light path simulation diagram of the display device provided by the embodiment shown in FIG25 ;

FIG27 is a schematic diagram showing the structure of a display device provided by another embodiment of the present disclosure;

Figure 28 is a comparison diagram of the screen edge brightness curves of the display device provided by the embodiment of the present disclosure and the display device in the prior art, wherein the a’ curve is the brightness curve of the display device provided by the embodiment of the present disclosure, and the b’ curve is the brightness curve of the display device in the related art. The horizontal axis represents the distance from the edge display area of the module, and the vertical axis represents the relative brightness ratio between the screen edge and the screen center area.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

Before describing in detail the display device and display driving method provided by the embodiments of the present disclosure, it is necessary to describe the related technologies as follows:

In the related art, the display device mainly includes a display module and a backlight source. Due to the influence of the size tolerance of components such as the middle frame in the backlight source and the assembly position tolerance, the black matrix in the frame or the color film substrate will block some sub-pixels at the boundary of the display area.

As shown in FIG1 , in the related art, the display module adopts the traditional standard pixel arrangement. The shielding member 1 such as the middle frame or black matrix of the backlight source will partially enter the display area, and will block the entire column or part of the sub-pixels of the same color at the boundary position of the display area, thereby causing uneven color mixing of RGB pixels and producing rainbow patterns. For example, in FIG2 , the first column of R pixels and the second column of G pixels on the left side of the display module are blocked, resulting in a blue rainbow pattern on the left side of the display module; in FIG2 , the first column of B pixels and the second column of G pixels on the right side of the display module are blocked, resulting in a red rainbow pattern on the right side of the display module.

In order to solve the above problems, please refer to Figure 3. The display device provided by the embodiment of the present disclosure adopts a staggered arrangement method in the pixel arrangement structure of the display module. That is, the display module has a pixel array, and each pixel unit in the pixel array includes at least two sub-pixels of different colors, and the sub-pixels of the same color in adjacent rows are staggered.

With this arrangement, although the entire column or local sub-pixels at the boundary of the display area will be blocked, each column of sub-pixels at the boundary of the display area has at least two sub-pixels of different colors, such as R, G, and B sub-pixels. Therefore, the entire column or local sub-pixels at the boundary of the display area and not blocked can still form white light through light mixing, thereby avoiding the phenomenon of rainbow lines at the edge of the display area in the prior art.

For example, in FIG4 , the first column of sub-pixels and the second column of sub-pixels are blocked at the boundary of the display area of the display module, the third column of sub-pixels are not blocked or partially blocked, and the third column of sub-pixels are arranged alternately with BRG sub-pixels from top to bottom. Therefore, adjacent BRG sub-pixels in the third column of sub-pixels are mixed to form white light, so the picture is still white lines, and no rainbow pattern phenomenon will occur.

Based on the above-mentioned staggered pixel arrangement structure, the display device provided in the embodiment of the present disclosure can effectively improve the rainbow pattern phenomenon at the edge of the display screen.

In some embodiments, as shown in FIG3 , each pixel unit in the pixel array includes RGB three-color sub-pixels, i.e., red, green, and blue sub-pixels; in other embodiments, as shown in FIG4 , each pixel unit in the pixel array may also include RGBW four-color sub-pixels, i.e., red, green, blue, and white sub-pixels; in other embodiments, since the RB brightness recognized by the human eye is much lower than the G brightness, the balance of RGB sub-pixel brightness can be achieved by designing sub-pixels of different sizes. As shown in FIG5 , the size of the G sub-pixel is smaller than the size of the RB sub-pixel.

After further research, the inventors of the present disclosure found that if the pixel arrangement structure is only designed as a staggered pixel arrangement, although the rainbow pattern phenomenon at the edge of the display screen can be solved, the jagged phenomenon at the edge of the screen will still exist.

The specific mechanism of generating jagged edges is analyzed as follows.

For short-distance viewing, such as viewing distance within 1 meter, the causes of aliasing are analyzed as follows:

The edge of the display module is displayed at a close distance, and the color of the edge of the screen is poor. The first column on the left side of Figure 8 is the edge of the screen. Combined with the principle of RGB primary color mixing shown in Figure 9, it can be seen that the first and second columns are B and R sub-pixels mixed to form purple; R and G sub-pixels mixed to form yellow; G and B sub-pixels mixed to form cyan. According to the principle of colorimetry, white light is generally a mixture of the three primary colors of red, green and blue according to the brightness ratio. When the brightness of red, green and blue in the light is close to 2:7:1, the human eye perceives pure white after the light is mixed. However, the brightness value of the RGB sub-pixels at the edge of the screen of the pixel structure arranged in the wrong order is measured, and the brightness ratio of the RGB sub-pixels is approximately 1.6:7.4:1. From the brightness ratio data, it can be seen that the brightness of the B and R sub-pixels is much lower than that of the G sub-pixels, that is, the low-brightness sub-pixels are visually viewed as dark areas, and the high-brightness sub-pixels are visually viewed as bright areas, thus forming a jagged dark area (the area shown in the dotted box A in Figure 8 is the dark area). Therefore, the brightness of the R, G, and B sub-pixels is uneven, and the light mixing of two adjacent sub-pixels at the edge of the picture is uneven, which will cause color aliasing at the edge of the picture at close distances.

For viewing images at a slightly longer distance, such as between 1 meter and 2 meters, the causes of aliasing are analyzed as follows:

For the pixel structure with disorganized arrangement, the brightness value of the RGB sub-pixels in the screen is measured, and the brightness ratio of the RGB sub-pixels is about 1.6:7.4:1 (the brightness ratio of the RGB sub-pixels in the area shown by the dotted box A' in the figure is 1.6:7.4:1). All the bright spots in the screen are G sub-pixels, the dark area on the left side of the bright spots is the R sub-pixel position, and the dark area on the right side is the B sub-pixel position. The reason is that the brightness of the G sub-pixel is high, and the brightness of the R and B sub-pixels is low. After mixing the light, the bright area is still in the pixel area with the highest brightness. This interval between bright and dark areas is not visible to the human eye at a long distance. From the arrangement of the edge pixels of the screen shown in Figure 10, it can be seen that the bad aliasing at the edge of the screen is due to the low brightness of the R and B sub-pixels. When viewed from a long distance, the light intensity is weak and the human eye cannot receive the light, so the R and B sub-pixels are dark. Therefore, the brightness of the R, G, and B sub-pixels is uneven, and the low light intensity of the low-brightness R and B sub-pixels at a long distance produces dark areas to form aliasing.

For viewing from a long distance, for example, the viewing distance is more than 2 meters:

As shown in Figure 11, the edge image effect of the display module at a long distance, the jagged edges are not visible, and there is no abnormality in the edge image. Figure 12 is a schematic diagram of the principle of the minimum resolution angle of the human eye, that is, assuming that there are two points A and B in the distance, to clearly distinguish these two points, there needs to be a certain distance between the two points. The lower limit of the distance between the two points is related to the human eye's viewing angle α. The minimum resolution angle of the human eye refers to the ability of the human eye to distinguish the smallest details. The minimum angle that can be distinguished is: θ = 1.22λ/D, where D is the diameter of the pupil and λ is the wavelength of the light source. Therefore, according to the Rayleigh criterion, if the resolution angle θ is less than the minimum resolution angle, the image of the object cannot be displayed. The resolution ability of the human eye: the light emitted by the object passes through the pupil of the human eye and is imaged on the retina through the refraction system of the human eye. The pupil is basically a round hole, and its diameter is adjusted by the iris in the range of 2 to 8mm. Under normal light brightness conditions, the pupil diameter is about 3mm. The wavelength of green light that the human eye is most sensitive to is 550nm, and the minimum resolution angle of the human eye is approximately equal to 1' (corresponding to 1.0 on the vision chart).

FIG13 shows a display device pixel resolution distance calculation model provided by the present disclosure, that is, tan(α/2)=(0.53/2)/L, where α is substituted into the formula according to the normal human eye resolution angle 1'. The RGB pixel size of the present invention is 0.53mm, so L=1822mm. That is, when L＞1821mm, the human eye cannot distinguish sub-pixels, which is basically consistent with the actual observation effect. In summary, there is no abnormality in the picture at a long distance. The reason is that the resolution ability of the human eye is limited, and the sub-pixels cannot be seen. What is seen is the picture after the mixed light of 3 or more sub-pixels.

In the related art, in order to improve the poor display at the edge of the screen, the solutions adopted are as follows: First, by changing the distribution of the black matrix at the edge of the screen to adjust the transmittance of the pixels at the boundary of the screen, the development cycle is long and the development cost is high. In addition, this method can only solve the poor jagged edges of the borders of a certain shape, but cannot solve the jagged edges of special pixel arrangements and different screens; second, directly block the pixels with jagged edges at the boundary of the screen through the black matrix or other shading structures to improve the display effect, but this is not conducive to narrow frame design, especially for display devices such as spliced screens, and a seamless splicing effect cannot be achieved.

In order to improve the problem of bad jagged edges on the screen, the display driving method is improved in the embodiment of the present disclosure in combination with the mechanism of bad jagged edges on the screen of the above-mentioned pixel arrangement structure arranged in the right and wrong order. It is possible to avoid the need for special design of the black matrix and no special requirements for the shape of the screen boundary, and at the same time, there is no need to block the screen boundary, which is more conducive to narrow frame design, especially, borderless design can be realized to achieve seamless splicing effect, and at the same time, the picture adjustment is more flexible.

As shown in FIG14 , the display driving method provided in the embodiment of the present disclosure is used to drive a display module to display; the display module has a pixel array, each pixel unit in the pixel array includes at least two sub-pixels of different colors, and sub-pixels of the same color in adjacent rows are staggered; the method includes:

Step S01, pre-storing a correspondence between the position of a sub-pixel in a light-dark boundary area and a corresponding target grayscale value, wherein the light-dark boundary area is configured as an area within a predetermined threshold distance from a light-dark pixel boundary line, the light-dark pixels are adjacent sub-pixels whose initial grayscale difference is greater than a first predetermined grayscale difference △L1, and the correspondence is configured along a direction from the light-dark pixel boundary line to a sub-pixel with a larger initial grayscale value among the two adjacent sub-pixels, and the closer the position of the sub-pixel is to the light-dark pixel boundary line, the lower the target grayscale value;

Step S02: determining the current grayscale value of the sub-pixel in the light-dark boundary area according to the pre-stored corresponding relationship, and converting it into a corresponding display signal to drive the display module to display a corresponding picture.

The above method controls the sub-pixels in the light-dark boundary area to point from the light-dark pixel boundary line to the sub-pixel with a larger initial grayscale value during display driving. The closer the position of the sub-pixel is to the edge of the display module, the lower the target grayscale value. In this way, the brightness of the sub-pixels located at the edge of the display screen gradually decays at the light-dark boundary of the picture, forming an effect of gradual transition of the picture brightness, improving the light-dark contrast of the sub-pixels at the boundary of the picture, weakening the human eye's perception of brightness changes at the boundary of the picture, so as to solve the picture jagged problem caused by the out-of-order arrangement of pixels and improve the user experience.

Through this display driving method, compared with the related art of changing the shape of the black matrix at the boundary of the screen to change the sub-pixel transmittance and blocking the boundary of the screen, there is no need to design the shape and feature arrangement of the black matrix, which saves the production cost, simplifies the production process, shortens the development cycle, and has more flexible adjustment space, which can be adjusted for different screens and screens of different shapes. In addition, there is no need to block the boundary of the screen, which is more conducive to narrow frame or even borderless design.

The display driving method disclosed herein is described in more detail below.

Before the above step S01, as shown in FIG15 , the method further includes:

Step S01', identifying the initial grayscale value of the sub-pixel in the current picture;

Step S02', identifying two adjacent sub-pixels whose initial grayscale values are greater than a preset difference value according to the initial grayscale value, so as to determine the boundary line between the light and dark pixels;

Step S03': determining the light-dark boundary area according to the preset threshold.

Specifically, the above step S01' specifically includes:

Step S011', setting a gamma curve to set the corresponding relationship between the pixel grayscale value and the display brightness;

Among them, the pixel grayscale value represents the different brightness levels between the brightest and the darkest displayed, and the pixel grayscale value is convenient for controlling the display brightness through the driving voltage. For example, each pixel unit includes RGB sub-pixels. By adjusting the grayscale values of the three RGB sub-pixels corresponding to each pixel unit, the color and brightness displayed by the three sub-pixels corresponding to the pixel unit can be changed. The gamma curve is a curve that reflects the brightness changes corresponding to each grayscale value. The horizontal axis of the gamma curve is the grayscale, and the vertical axis is the brightness ratio.

The specific setting method of the gamma curve can be as follows: according to the gamma curve, the transmittance corresponding to each grayscale value is obtained; according to different grayscale values, the grayscale corresponding to the gamma voltage is obtained, and then the transmittance corresponding to the specific grayscale value is obtained, and the voltage value corresponding to each transmittance is determined. Specifically, through the V-T curve of the display module, the voltage closest to the corresponding transmittance is found as the corresponding gamma voltage.

FIG18 shows a gamma curve of a display module in some embodiments of the present disclosure. According to the gamma curve, the corresponding relationship between the brightness and grayscale value of the display module can be reflected, wherein the horizontal axis is the grayscale value, the vertical axis is the brightness ratio, and the entire gamma curve has a smooth transition. At low grayscales, the curve changes slowly; at high grayscales, the curve changes steeply. The gamma value can be set to 2.2±0.2. Curve a in the figure is the curve when the gamma value is equal to 2.2, and curve b is the curve when the gamma value is equal to 2.4. The dotted curve c is the curve actually set for the display module in an embodiment of the present disclosure, and the gamma value can be between 2.2 and 2.4.

Step S012', identifying the displayed image to identify the initial grayscale value of the sub-pixel in the current image;

In this step, by scanning all sub-pixels in the display screen row by row and column by column, when the display module receives a frame of digital image to be displayed, the sub-pixels in the digital image are analyzed and identified to obtain the initial grayscale value corresponding to the sub-pixel. Taking a sub-pixel as an example, when the thin film transistor of the sub-pixel is turned on, the Sourse IC (power driver IC) outputs the driving voltage VD of the corresponding grayscale and transmits it to the pixel electrode of the sub-pixel. The driving voltage VD on the pixel electrode forms a voltage difference with the common electrode voltage VCOM to control the deflection angle of the liquid crystal molecules and realize the brightness control of the sub-pixel. The larger the driving voltage of the sub-pixel, the larger the grayscale value and the higher the brightness. The above scanning process and the pixel grayscale recognition process can be carried out synchronously. The driver IC (T-con IC) with a gamma curve pre-stored can assign the sub-pixel driving voltage of the grayscale value recognized for each frame of the picture, that is, after the grayscale value of a sub-pixel is scanned, the voltage value corresponding to the sub-pixel can be directly assigned.

Step S013', identifying two adjacent sub-pixels whose initial grayscale values are greater than a preset difference value according to the initial grayscale value, so as to determine the boundary line between the light and dark pixels;

In this step, two adjacent sub-pixels whose initial grayscale difference is greater than the first predetermined grayscale difference ΔL1 are identified, and the sub-pixel with higher brightness among the adjacent sub-pixels whose grayscale difference is greater than ΔL1 is set as the boundary reference of the light-dark boundary area requiring grayscale adjustment.

It should be noted that in the above solution, the predetermined grayscale difference can be a range of grayscale difference values of light and dark pixels defined according to actual product needs. For example, the first predetermined grayscale difference △L1 can be 200 grayscales. When the grayscale difference of adjacent sub-pixels reaches 200 grayscales, the sub-pixel with higher brightness among the adjacent sub-pixels can be used as the boundary reference of the light-dark boundary area, and the area between the adjacent sub-pixels is the light-dark boundary of the picture.

In addition, exemplarily, the corresponding relationship is specifically configured as follows: along the direction from the boundary line of the light and dark pixels to the sub-pixel with the larger initial grayscale value among the two adjacent sub-pixels, the sub-pixels in the light and dark boundary area are divided into N groups at a predetermined interval, N is an integer greater than 1, and the predetermined interval is an integer multiple of the length of a sub-pixel along the row direction or an integer multiple of the width of a sub-pixel along the row direction; along the direction from the boundary line of the light and dark pixels to the sub-pixel with the larger initial grayscale value among the two adjacent sub-pixels, the target grayscale values of the N groups of sub-pixels gradually change from the lowest target grayscale value L0 to the highest target grayscale value Lh with a second predetermined grayscale difference △L2, and the second predetermined grayscale difference △L2 is (Lh-L0)/N.

In the above scheme, the sub-pixels in the light-dark boundary area are divided into N groups at a predetermined interval, N is an integer greater than 1, and the predetermined interval is an integer multiple of the length of a sub-pixel along the row direction or an integer multiple of the width of a sub-pixel along the row direction. Specifically, it means that along the direction from the boundary reference of the light-dark boundary area to the sub-pixel with a larger initial grayscale value among the two adjacent sub-pixels, each group of sub-pixels may include at least one row or at least one column of sub-pixels, and the target grayscale values of the two adjacent groups of sub-pixels gradually change with a second predetermined grayscale difference △L2, so that the brightness of the sub-pixels in the light-dark boundary area is evenly transitioned, thereby reducing the light-dark contrast at the boundary of the picture.

For example, along the direction from the edge of the display module to the middle area of the display module, N groups of sub-pixels are sequentially arranged as the 1st group, the 2nd group...the Nth group, and the difference in grayscale values between two adjacent groups of sub-pixels from the 1st group of sub-pixels to the Nth group of sub-pixels is the second predetermined grayscale difference △L2. That is, starting from the 1st group of sub-pixels, each group of sub-pixels has an increase in the grayscale value of the previous group of sub-pixels by the second predetermined grayscale difference △L2 until the grayscale value of the Nth group of sub-pixels increases to the brightest grayscale value.

It should be noted that the larger the value of N, the finer the picture transition effect and the more delicate the picture effect. However, the larger the value of N, the more complicated the adjustment and the lower the adjustment efficiency. In practical applications, the specific value of N can be determined according to the image quality requirements. It should also be noted that the highest target grayscale value Lh can be the initial grayscale value of the sub-pixel with the larger initial grayscale value among the two adjacent sub-pixels.

In addition, in some exemplary embodiments, the at least two sub-pixels of different colors include a red sub-pixel, a green sub-pixel, and a blue sub-pixel; and determining the current grayscale value of the sub-pixel in the light-dark boundary region according to the pre-stored corresponding relationship specifically includes: determining the target grayscale value of all color sub-pixels in the light-dark boundary region according to the pre-stored corresponding relationship. That is, in some embodiments, all color sub-pixels in the light-dark boundary region may be gradually transitioned.

Specifically, by reducing the grayscale brightness of the three columns of sub-pixels at the light and dark boundary of the black and white grid picture column by column, the picture transition effect is improved, thereby solving the problem of picture jaggedness. In the black and white grid picture, the first column of RGB sub-pixels at the light and dark boundary of the white grid and the black grid is adjusted from 255 grayscale to 93 grayscale; the second column of RGB sub-pixels is adjusted from 255 grayscale to 143 grayscale; the third column of RGB sub-pixels is adjusted from 255 grayscale to 203 grayscale.

More specifically, FIG. 19 shows a logic diagram of a display driving method provided by an embodiment of the present disclosure, taking a display screen as black and white grids as an example. Please refer to FIG. 16 . The method may include the following steps:

First, set the Gamma curve to set the relationship between pixel grayscale and brightness;

Then, the pixels are scanned line by line, and the positions of the light-dark boundary lines of the 0 grayscale and 255 grayscale pixels of the black-and-white grid screen are identified according to the voltage values, and the 255 grayscale pixels at the positions of the light-dark boundary lines are used as the reference boundary of the light-dark boundary area, and according to the pre-stored predetermined threshold, the area where the sub-pixels located within the predetermined threshold from the reference boundary to the white grid screen are located is used as the light-dark boundary area;

Then, adjust the grayscale of the first group of sub-pixels so that the adjusted grayscale is less than the initial grayscale value, for example, 93; adjust the grayscale of the second group of sub-pixels so that the adjusted grayscale is less than the initial grayscale value and greater than the grayscale value of the first group of sub-pixels, for example, 143; adjust the grayscale of the third group of sub-pixels so that the adjusted grayscale is less than the initial grayscale value and greater than the grayscale value of the second group of sub-pixels, for example, 203, thereby completing the pixel position identification and grayscale setting of the light and dark boundary area.

In other embodiments, determining the current grayscale value of the sub-pixel in the light-dark boundary area according to the pre-stored correspondence specifically includes: determining the current grayscale value of the green sub-pixel in the light-dark boundary area according to the pre-stored correspondence, and the target grayscale values of the red sub-pixel and the blue sub-pixel in the light-dark boundary area are the initial grayscale values of the red sub-pixel and the blue sub-pixel in the light-dark boundary area.

The above solution is adopted to optimize the jagged edges of the picture by adjusting the green sub-pixel at the boundary between light and dark.

From the above-mentioned aliasing principle mechanism, it can be known that the brightness of the G sub-pixel is higher than that of the R and B sub-pixels, so dark areas will be generated at the R and B pixel positions and bright areas will be generated at the G pixel positions, resulting in aliasing. Based on the above-mentioned distance, in another embodiment of the present disclosure, the grayscale value of the N most edge groups of G sub-pixels can be reduced to make the G sub-pixels in the light and dark boundary area transition evenly, so that the brightness contrast of the R, G, and B sub-pixels is not obvious, thereby improving the aliasing.

It should be noted that, compared with the embodiment in which the grayscale values of all color sub-pixels in the light-dark boundary area are gradually transitioned, in this embodiment, since only the grayscale brightness of the G sub-pixel is adjusted, the grayscale brightness of the R and B sub-pixels does not gradually transition. In the RGB color mixing process, the red, green and blue primary colors are not mixed according to the brightness ratio, because pure white light may not be formed, resulting in local color cast. Therefore, in practical applications, the image jaggedness and poor color cast can be balanced in the actual adjustment process to achieve acceptable image quality.

Specifically, in the black and white grid picture, the first column of G sub-pixels at the edge of the boundary between the white grid and the black grid are adjusted from 255 grayscale to 64 grayscale; the second column of G sub-pixels are adjusted from 255 grayscale to 128 grayscale; and the third column of G sub-pixels are adjusted from 255 grayscale to 192 grayscale.

More specifically, taking the display screen as black and white grid as an example, the logic diagram of the display driving method provided by the embodiment of the present disclosure is shown in FIG17 . The method may include the following steps:

Then, the pixels are scanned line by line, and the position of the boundary line between the light and dark pixels at 0 grayscale and 255 grayscale of the black and white grid screen is determined according to the voltage value, and the 255 grayscale pixel at the position of the boundary line between the light and dark pixels is used as the reference boundary of the light and dark boundary area, so as to determine that the area within a predetermined threshold from the reference boundary in the white grid screen is the light and dark boundary area;

Then, adjust the grayscale of the first group of G sub-pixels so that the adjusted grayscale is less than its initial grayscale value, for example, 64; adjust the grayscale of the second group of G sub-pixels so that the adjusted grayscale is less than its initial grayscale value and greater than the grayscale of the first group of G sub-pixels, for example, 128; adjust the grayscale of the third group of sub-pixels so that the adjusted grayscale is less than its initial grayscale value and greater than the grayscale of the second group of sub-pixels, for example, 192, thereby completing the pixel position identification and grayscale setting of the light and dark boundary area.

Please refer to Figure 19, in which (a) is a schematic diagram of the jaggedness generated at the black and white grid boundary of the display screen in the related art, and (b) is a schematic diagram of the improvement effect of the jaggedness of the screen by applying the display driving method provided by the embodiment of the present disclosure. As can be seen from Figure 19, the display driving method provided by the embodiment of the present disclosure can effectively improve the jaggedness of the screen and enhance the display effect of the screen.

In addition, in a second aspect, an embodiment of the present disclosure provides a display device, as shown in FIG21 , the display device includes:

A display module 100 is used to display a corresponding picture according to a display signal. The display module 100 has a pixel array. Each pixel unit in the pixel array includes at least two sub-pixels of different colors, and sub-pixels of the same color in adjacent rows are staggered; and

The processor 200 includes:

The storage module 210 pre-stores a correspondence between the position of a sub-pixel in a light-dark boundary area and a corresponding target grayscale value, wherein the light-dark boundary area is configured as an area within a predetermined threshold distance from a light-dark pixel boundary line, the light-dark pixels are adjacent sub-pixels whose initial grayscale difference is greater than a first predetermined grayscale difference △L1, and the correspondence is configured along a direction from the light-dark pixel boundary line to a sub-pixel with a larger initial grayscale value among the two adjacent sub-pixels, and the closer the position of the sub-pixel is to the light-dark pixel boundary line, the lower the target grayscale value; and

The control module 220 determines the current grayscale value of the sub-pixel in the light-dark boundary area according to the pre-stored corresponding relationship, and converts it into a corresponding display signal to drive the display module 100 to display the corresponding picture.

In the above scheme, the display device adopts a staggered arrangement of pixels, and at the same time, the processor 200 identifies and adjusts pixels with large brightness differences, and gradually increases the grayscale value of the sub-pixel at the boundary of light and dark, so that the brightness of the pixels at the boundary of light and dark gradually changes, thereby improving the brightness and darkness contrast of the pixels at the boundary of light and dark on the screen and solving the problem of jagged edges on the screen. The display device provided by the embodiment of the present disclosure does not require a special shape of the black matrix, and the scheme is flexible and fast to adjust, reducing product costs and shortening the development cycle.

Exemplarily, the corresponding relationship stored in the storage module 210 is specifically configured as follows:

Along the direction from the edge of the display module 100 to the middle area of the display module 100, the sub-pixels in the light-dark boundary area are divided into N groups at a predetermined interval, N is an integer greater than 1, and the predetermined interval is an integer multiple of the length of a sub-pixel along the row direction or an integer multiple of the width of a sub-pixel along the row direction; along the direction from the edge of the display module 100 to the middle area of the display module 100, the target grayscale values of the N groups of sub-pixels gradually change from the lowest target grayscale value L0 to the highest target grayscale value Lh with a second predetermined grayscale difference △L2, and the second predetermined grayscale difference △L2 is (Lh-L0)/N.

For example, along the direction from the edge of the display module 100 to the middle area of the display module 100, N groups of sub-pixels are sequentially arranged as the 1st group, the 2nd group...the Nth group, and the difference in grayscale values between two adjacent groups of sub-pixels from the 1st group of sub-pixels to the Nth group of sub-pixels is the second predetermined grayscale difference △L2. That is, starting from the 1st group of sub-pixels, each group of sub-pixels has a grayscale value that is greater than the grayscale value of the previous group of sub-pixels by the second predetermined grayscale difference △L2 until the grayscale value of the Nth group of sub-pixels increases to the brightest grayscale value.

Exemplarily, the control module 220 is specifically used for:

In the above solution, the image edge jaggedness can be optimized by adjusting the grayscale of all color sub-pixels in the light-dark boundary area or adjusting only the grayscale of the green sub-pixel in the light-dark boundary area.

Exemplarily, as shown in FIG22 , the processor 200 further includes:

An identification module 230, used to identify the initial grayscale value of the sub-pixel in the current picture;

A first determination module 240 is used to identify two adjacent sub-pixels whose initial grayscale values are greater than a preset difference value according to the initial grayscale value, so as to determine the boundary line between the light and dark pixels;

The second determination module 250 is used to determine the light-dark boundary area according to the preset threshold.

In addition, the display device provided by the embodiment of the present disclosure may mainly include a display module 100 and a backlight source 300 disposed on a non-display side of the display module 100 .

Exemplarily, the backlight source 300 may include: a back plate 310, an optical film material 320, a diffusion plate 330, a middle frame 340, a light shielding tape 350, etc.

The back plate 310 can be made of common materials including SECC, SGCC, Al, etc., and its main function is to support the entire module and fix the middle frame 340 and other parts. In the embodiment of the present disclosure, the back plate 310 can be made of SECC material and is fixed to the middle frame 340 as a whole by screws.

The optical film material 320 may include a prism film, a diffusion film, etc., and its main function is to make the light emitted by the light source in the module more uniform and brighter.

The material of the diffusion plate 330 may include PS, PC, etc., and it mainly plays the role of making the light emitted by the light source in the module more uniform.

The material of the middle frame 340 includes PC, PC and glass fiber composite material or Al, etc., and its main function is to support and fix the display panel through the support surface. For example, as shown in FIG23, a slope 341 is provided on the middle frame 340, and the slope 341 can be provided with a reflective surface, through which the light emitted by the light source can be reflected. For example, the middle frame 340 is made of aluminum and is integrally formed by an extrusion molding die. The support surface of the middle frame 340 and the display panel are bonded by thermosetting adhesive, so that the display panel and the middle frame 340 form an integrated structure.

The material of the light-shielding tape 350 can be PET, which can be a black PET tape, which is attached to the side edge of the display panel and the outer side of the support surface of the middle frame 340 to prevent the light in the module from penetrating through the side of the module and causing light leakage.

The display module 100 may include a display panel 110, a polarizer 120 attached to the display side and/or non-display side of the display panel 110, etc. FIG20 is a schematic diagram of the structure of the display module in an embodiment. As shown in FIG20, the display panel 110 includes a binding side (shown in the dotted box E in the figure) and other sides (shown in the dotted box F in the figure) except the binding side, and a circuit board is bound and connected on the binding side, and the frame size D1 of the binding side is greater than the frame size D2 of the other sides.

In the related art, the polarizer 120 is used to laminate the sheet of the polarizer 120 with the substrate of the display panel 110. Due to the size tolerance of the sheet of the polarizer 120 itself and the attachment error of the laminating equipment, the size and tolerance of the edge of the polarizer 120 from the edge of the substrate of the display panel 110 after lamination is 0.3±0.3mm. If the light of the backlight source 300 is directly emitted without passing through the polarizer 120 on the color film substrate side, it will cause light leakage at the edge of the polarizer 120, affecting the image quality around the display module 100.

To improve the above problem, in the embodiment of the present disclosure, as shown in Figure 24, the distance between the polarizer 120 and the edge of the display module 100 is less than or equal to 0.2 mm. Exemplarily, the distance between the polarizer 120 and the edge of the display module 100 is 0.1±0.1 mm.

In the above scheme, the polarizer 120 can be a roll polarizer 120. After being bonded to the substrate of the display panel 110, the roll polarizer 120 is cut using a laser cutting device. Since the laser cutting device has high precision and is not affected by the sheet size tolerance, the size and tolerance of the polarizer 120 from the edge of the substrate of the display panel 110 can be increased to 0.1±0.1mm, thereby avoiding the direct emission of light from the polarizer 120 without passing through the color film substrate, improving the light leakage from the edge of the polarizer 120, and improving the image quality around the display module 100.

In addition, exemplarily, as shown in FIG. 24 , the backlight source 300 includes a frame 360 arranged on the outside of the display module 100, wherein on the side facing the light emitting side of the display device, a light-shielding colloid 400 is coated in the space between the frame 360 and the edge of the display module 100, and the light-shielding colloid 400 overlaps the edge of the polarizer 120 on the display side of the display module 100.

Using the above scheme, Figure 24 is a structural schematic diagram of the binding side, where a frame 360 is further provided on the outside of the display panel 110 and the middle frame 340, and a light-shielding colloid 400 is coated in the space between the frame 360 and the edge of the display module 100. The light-shielding colloid 400 is, for example, black hot melt adhesive and overlaps with the edge of the polarizer 120, which can further prevent the backlight from being emitted from the edge of the polarizer 120, thereby playing a light-shielding role to solve the light leakage phenomenon at the edge of the display module 100.

Exemplarily, on the side facing the light emitting side of the display device, the edge of the frame 360 is higher than the surface of the polarizer 120 on the display side of the display module 100 which is away from the display module 100 .

By adopting the above solution, the design height of the frame 360 is higher than the height of the polarizer 120 on the color film substrate side of the display module 100, which can further optimize the coating effect of the shading colloid 400 and prevent the shading colloid 400 from flowing out of the edge of the frame 360 and affecting the appearance of the module.

In addition, in the related art, a black shading tape 350 is pasted on the outside of the frame 360, and the black shading tape 350 will be bent onto the surface of the display panel 110. During the manual affixing operation on the production line, the shading tape 350 may easily block the display area, causing the edge pixels of the display panel 110 to be blocked, thereby affecting the image quality of the display module 100.

As shown in FIG. 24 , illustratively, a light shielding tape 350 is adhered to the outer side of the frame 360 , and the light shielding tape 350 is flush with the edge of the frame 360 on the side facing the light emitting side of the display device.

By adopting the above scheme, in the display device provided by the embodiment of the present disclosure, the light-shielding tape 350 pasted on the outer side of the frame 360 is not folded over the panel of the display panel 110, thereby avoiding the phenomenon of pixel occlusion caused by manual attachment of the light-shielding tape 350 and improving the picture effect.

In addition, in the related art, the middle frame 340 serves to fix and support the display panel 110. However, due to the design of the ultra-narrow bezel 360, the middle frame 340 sometimes enters the display area of the display panel 110 due to dimensional tolerance and assembly tolerance, causing the light at the edge of the display panel 110 to be blocked, resulting in a dark line problem at the edge of the module.

In order to solve the above problems, as an exemplary embodiment, as shown in Figure 24, the optical film material 320 in the backlight source 300 is arranged on the non-display side of the display module 100; the middle frame 340 is arranged on the side of the optical film material 320 away from the display module 100 and supported on the edge of the display module 100, and the middle frame 340 is located on the inner side of the frame 360; wherein the middle frame 340 includes a supporting surface for supporting the display module 100, and the width d of the supporting surface is less than or equal to 0.8 mm in the direction from the edge of the display module 100 to the display area of the display module 100.

In the above solution, the width of the support surface of the middle frame 340 is reduced from 1.0 mm to 0.8 mm. Under the premise of satisfying the supporting function, the dark line problem caused by the edge of the display panel 110 being blocked is optimized, and the module image quality is improved.

In addition, as an exemplary embodiment, the display device provided in the embodiment of the present disclosure is conducive to the design of a narrow frame 360 due to its improved pixel arrangement, display driving method and/or module structure, and can be applied to a spliced screen. The number of the display modules 100 in the display device can be at least two, at least two of the display modules 100 are spliced with each other, and there is a splicing seam 100' between two adjacent display modules 100. The splicing seam 100' can be about 2 mm.

In one embodiment, as shown in FIG. 25 , the display device further includes a transparent cover plate 500, wherein the transparent cover plate 500 is disposed on the display side of the display module 100, and a surface of the side of the transparent cover plate 500 facing away from the display module 100 is a curved surface 510 in an edge area close to the joint seam 100'.

In the above solution, the transparent cover plate 500 can be made of transparent materials such as film or PMMA, and the transparent cover plate 500 can include a plane area and an edge area located outside the screen area, the edge area is closer to the joint seam 100', and the edge area is designed to be in the shape of a curved surface 510, and the main function is to use the refraction of light by the curved surface 510 to converge the light emitted from the display area to the joint seam 100', thereby eliminating the joint seam 100'. The protective cover plate can be attached to the display panel 110 by OCA optical adhesive.

In addition, it should be noted that FIG26 is a light path simulation diagram of the protective cover plate to achieve seamless splicing. Taking the orientation shown in FIG26 as an example, the display area of the display module 100 on the left side is from the side close to the splicing seam 100' to the side away from the splicing seam 100', and the sub-pixels are repeatedly arranged from right to left, and each pixel unit includes R sub-pixels, G sub-pixels, and B sub-pixels arranged in sequence. Tracing the light propagation path shows that the light emitted by the R sub-pixel in the first pixel unit closest to the edge position can cover the L1 area shown in the figure after passing through the arc surface 510 of the edge area of the protective cover. Similarly, the light emitted by the G sub-pixel in the first pixel unit can cover the L2 area shown in the figure after passing through the arc surface 510 of the edge area of the protective cover. The light emitted by the B sub-pixel in the first pixel unit can cover the L3 area shown in the figure after passing through the arc surface 510 of the edge area of the protective cover. The light emitted by the R sub-pixel in the second pixel unit can cover the L4 area shown in the figure after passing through the arc surface 510. The lengths of L1, L2, and L3 are all greater than the lengths of the original R sub-pixel, G sub-pixel, and B sub-pixel, and the length of L4 is the same as the length of the original R sub-pixel. In other words, the lengths of the RGB sub-pixels in the first pixel unit are all magnified after passing through the arc surface 510 of the protective cover. After magnification, it is easier for the human eye to distinguish red, green, blue, and other monochrome sub-pixels at the same distance, rather than white pixels mixed with RGB sub-pixels. However, in the display device provided by the embodiment of the present disclosure, since the pixels are arranged in a staggered order, although the pixels near the joint seam 100' are still magnified, each column of adjacent pixels are not pixels of the same color, but three colors of RGB are adjacent. Therefore, the magnified pixels can still be mixed to form white pixels, and the human eye will not distinguish rainbow patterns.

It can be seen that the display device provided by the embodiment of the present disclosure is based on the technical solution of staggered pixel arrangement and brightness transition display in the light-dark boundary area, and the dark line at the light-dark boundary is improved, that is, the brightness of the pixels at the light-dark boundary is improved. Therefore, after the protective cover is set, the pixels near the joint seam 100' are enlarged and filled into the joint seam 100', and the brightness is not much different from other surrounding pixels, and the phenomenon of dark line enlargement will not occur, thereby improving the joint seam 100' effect of the seamless joint product.

In the related art, the seamless splicing effect of the display device is poor because the display module 100 has a dark line problem. Therefore, after the protective cover is set, the dark line is magnified, resulting in a poor effect of the splicing seam 100'. As shown in the figure, the seamless splicing effect of the display device of the present invention is significantly improved.

In addition, as shown in FIG28, it is a comparison diagram of the edge brightness curves of the display device of the present invention and the display module 100 in the related art, wherein curve a' is the edge brightness curve of the display device of the present invention, and curve b' is the edge brightness curve of the display device in the related art, the abscissa represents the distance from the edge display area of the display module 100, and the ordinate represents the relative brightness ratio of the edge of the picture and the center area of the picture. It can be seen from FIG28 that the difference between the peripheral brightness and the central area brightness of the display device module provided by the embodiment of the present disclosure is reduced, and the brightness improvement effect is obvious.

In addition, in some other embodiments of the present disclosure, as shown in FIG27 , the display device further includes an optical lens 600, and the optical lens 600 has a sawtooth prism structure 610 on a surface on one side away from the display module 100, at least in an edge area close to the joint seam 100'.

By adopting the above scheme, the optical lens 600 can be a Fresnel optical lens, which has a sawtooth prism structure on the surface of the side away from the display module 100. When the light emitted from the display panel 110 passes through the optical lens 600 structure, the light will be refracted, and the originally large-angle light will be converged to a direction nearly perpendicular to the display panel 110 and emitted into the splicing seam 100'. The human eye recognizes the light at the splicing seam 100', thereby producing a seamless splicing effect.

The main material of the Fresnel optical lens 600 may be PET or PMMA, etc., and the Fresnel optical lens 600 and the display panel 110 may be bonded together by OCA optical adhesive.

There are a few points to note:

(1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

(2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

(3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

A display driving method for driving a display module to display; characterized in that the display module has a pixel array, each pixel unit in the pixel array includes at least two sub-pixels of different colors, and sub-pixels of the same color in adjacent rows are staggered; the method comprises:

Pre-storing a correspondence between the position of a sub-pixel in a light-dark boundary area and a corresponding target grayscale value, wherein the light-dark boundary area is configured as an area within a predetermined threshold distance from a light-dark pixel boundary line, the light-dark pixels are adjacent sub-pixels whose initial grayscale difference is greater than a first predetermined grayscale difference △L1, and the correspondence is configured along a direction from the light-dark pixel boundary line to a sub-pixel with a larger initial grayscale value among the two adjacent sub-pixels, and the closer the position of the sub-pixel is to the light-dark pixel boundary line, the lower the target grayscale value;

According to the pre-stored corresponding relationship, the current grayscale value of the sub-pixel in the light-dark boundary area is determined and converted into a corresponding display signal to drive the display module to display the corresponding picture.
The method according to claim 1, characterized in that

The corresponding relationship is specifically configured as follows:

Along the direction from the boundary line between the light and dark pixels to the sub-pixel with the larger initial grayscale value among the two adjacent sub-pixels, the sub-pixels in the light and dark boundary area are divided into N groups at a predetermined interval, N is an integer greater than 1, and the predetermined interval is an integer multiple of the length of a sub-pixel along the row direction or an integer multiple of the width of a sub-pixel along the row direction; along the direction from the boundary line between the light and dark pixels to the sub-pixel with the larger initial grayscale value among the two adjacent sub-pixels, the target grayscale values of the N groups of sub-pixels gradually change from the lowest target grayscale value L0 to the highest target grayscale value Lh with a second predetermined grayscale difference △L2, and the second predetermined grayscale difference △L2 is (Lh-L0)/N.
The method according to claim 1, characterized in that

The at least two sub-pixels of different colors include a red sub-pixel, a green sub-pixel, and a blue sub-pixel;

Determining the current grayscale value of the sub-pixel in the light-dark boundary area according to the pre-stored corresponding relationship specifically includes:

Determine the current grayscale values of all color sub-pixels in the light-dark boundary area according to the pre-stored corresponding relationship; or

According to the pre-stored corresponding relationship, the current grayscale value of the green sub-pixel in the light-dark boundary area is determined, and the target grayscale values of the red sub-pixel and the blue sub-pixel in the light-dark boundary area are the initial grayscale values of the red sub-pixel and the blue sub-pixel in the light-dark boundary area.
The method according to claim 1, characterized in that before pre-storing the correspondence between the position of the sub-pixel in the light-dark boundary area and the corresponding target grayscale value, the method further comprises:

Identify the initial grayscale value of the sub-pixel in the current picture;

Identify two adjacent sub-pixels whose initial grayscale values are greater than a preset difference value according to the initial grayscale value, so as to determine the boundary line between the light and dark pixels;

The light-dark boundary area is determined according to the preset threshold.
A display device, characterized in that the display device comprises:

A display module, used for displaying a corresponding picture according to a display signal, wherein the display module has a pixel array, each pixel unit in the pixel array includes at least two sub-pixels of different colors, and sub-pixels of the same color in adjacent rows are staggered; and

A processor, the processor comprising:

a storage module, pre-storing a correspondence between the position of a sub-pixel in a light-dark boundary area and a corresponding target grayscale value, wherein the light-dark boundary area is configured as an area within a predetermined threshold distance from a light-dark pixel boundary line, the light-dark pixels are adjacent sub-pixels whose initial grayscale difference is greater than a first predetermined grayscale difference △L1, and the correspondence is configured along a direction from the light-dark pixel boundary line to a sub-pixel with a larger initial grayscale value among the two adjacent sub-pixels, and the closer the position of the sub-pixel is to the light-dark pixel boundary line, the lower the target grayscale value; and

The control module determines the current grayscale value of the sub-pixel in the light-dark boundary area according to the pre-stored corresponding relationship, and converts it into a corresponding display signal to drive the display module to display the corresponding picture.
The display device according to claim 5, characterized in that

The corresponding relationship stored in the storage module is specifically configured as follows:

Along the direction pointing from the edge of the display module to the middle area of the display module, the sub-pixels in the light-dark boundary area are divided into N groups at a predetermined interval, N is an integer greater than 1, and the predetermined interval is an integer multiple of the length of a sub-pixel along the row direction or an integer multiple of the width of a sub-pixel along the row direction; along the direction pointing from the edge of the display module to the middle area of the display module, the target grayscale values of the N groups of sub-pixels gradually change from the lowest target grayscale value L0 to the highest target grayscale value Lh with a second predetermined grayscale difference △L2, and the second predetermined grayscale difference △L2 is (Lh-L0)/N.
The display device according to claim 5, characterized in that the control module is specifically used for:

Determine the current grayscale values of all color sub-pixels in the light-dark boundary area according to the pre-stored corresponding relationship; or

According to the pre-stored corresponding relationship, the current grayscale value of the green sub-pixel in the light-dark boundary area is determined, and the target grayscale values of the red sub-pixel and the blue sub-pixel in the light-dark boundary area are the initial grayscale values of the red sub-pixel and the blue sub-pixel in the light-dark boundary area.
The display device according to claim 5, characterized in that the processor further comprises:

An identification module, used to identify the initial grayscale value of the sub-pixel in the current picture;

A first determination module is used to identify two adjacent sub-pixels whose initial grayscale values are greater than a preset difference value according to the initial grayscale value, so as to determine the boundary line between the light and dark pixels;

The second determination module is used to determine the light-dark boundary area according to the preset threshold.
The display device according to claim 5, characterized in that the display device further comprises:

The polarizer is attached to the display side and/or the non-display side of the display module, and the distance between the polarizer and the edge of the display module is less than or equal to 0.2 mm.
The display device according to claim 9, characterized in that

The display device also includes a backlight source arranged on the non-display side of the display module, and the backlight source includes a frame arranged on the outside of the display module, wherein on the side facing the light output side of the display device, a light-shielding colloid is coated in the space between the frame and the edge of the display module, and the light-shielding colloid overlaps the edge of the polarizer on the display side of the display module.
The display device according to claim 10, characterized in that

On a side facing the light emitting side of the display device, an edge of the frame is higher than a surface of a side of the polarizer located on the display side of the display module that is away from the display module.
The display device according to claim 11, characterized in that

A light shielding tape is attached to the outer side of the frame, and on the side facing the light emitting side of the display device, the light shielding tape is flush with the edge of the frame.
The display device according to claim 10, characterized in that

The backlight source also includes:

An optical film material is arranged on the non-display side of the display module;

A middle frame is arranged on a side of the optical film material away from the display module and supported on the edge of the display module, and the middle frame is located on the inner peripheral side of the frame; wherein

The middle frame includes a supporting surface for supporting the display module, and a width of the supporting surface in a direction from an edge of the display module to a display area of the display module is less than or equal to 0.8 mm.
The display device according to claim 5, characterized in that

The display device has at least two display modules, at least two of which are spliced together, and a splicing seam is formed between two adjacent display modules;

The display device further comprises a transparent cover plate, the transparent cover plate is arranged on the display side of the display module, and a surface of the transparent cover plate on a side away from the display module is a curved surface in an edge area close to the joint; or

The display device further comprises an optical lens, wherein the optical lens has a sawtooth prism structure at least in an edge region close to the joint on a surface of a side away from the display module.